Foals Leo and Colby gave everyone a shock when they arrived two weeks early - and the biggest shock was no-one knew their mum was expecting twins! It is very rare for horses to have twins. When they do it is even more rare for both of them to survive.
The horses' owner, Becky Passmore, said: "I looked and saw one foal and then I turned around and saw another."
The foals were born in Somerset, England, and because they were so tiny they were taken to intensive care.
Anja Walker, the vet who looked after the foals, said they will take some time to gain their full strength.
But no-one can believe how well the foals are doing.
"One's slightly wobbly on his legs but they're both quite good and starting to do things on their own," said owner Becky. "They're surprising everyone."
CBBC Newsround | Animals | Twin foals beat odds to survive